App has useful functions. However, the coins such as a nickel are not the actual size of nickel. As result, a nickel can easily be confused with the quarter as they appear almost the same size on the screen. The coins should be their actual size. Also, there should be a way of just playing one game at a time as opposed to being forced to play random games that you may not want to practice.
Psycholawyer about Amazing Coin (USD) Dollar